Double Keychain Set 2012 Penny Keychains With Heart Around Year, 7 year Anniversary Perfect for couples 7 year anniversary gift (7 years gift, 7th year gift), or for a best friend gift The US one cent coin is called a penny and is a symbol of luck. Packaged on a cards with the saying "What a Lucky Year!" The copper coin is a USA one cent penny 20 mm diameter. Handmade item, engraved, made in USA, net weight: about 5g.